CVE-2026-72107
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk47th percentile - higher than 47% of all known CVEs
Summary
In the Linux kernel's dm-era module, there is an out-of-bounds memory access when the start sector is non-zero. The writeset block calculation does not apply the target offset, potentially leading to out-of-bounds read (detected by KASAN).
Risk Assessment
The vulnerability may lead to information disclosure or system crash if an attacker can configure a dm-era table with a non-zero start sector.
Recommendation
Apply the kernel patch that applies the offset before calculating the block, and restrict access to device-mapper configuration.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: dm era: fix out-of-bounds memory access for non-zero start sector dm-era tracks writes in target-relative blocks, but era_map() calculates the writeset block before applying the target offset. Tables with a non-zero start sector can therefore pass an absolute mapped-device block to metadata_current_marked(). If the absolute block is beyond the current writeset size, writeset_marked() tests past the end of the in-core bitset. KASAN reports this as a vmalloc-out-of-bounds access. Apply the target offset before calculating the era block so writeset lookups use the target-relative block number.